Amir ibn al-Tufayl

ʿĀmir ibn al-Ṭufayl was an arrogant chieftain of Najd who had earlier attempted to negotiate impossible conditions for his acceptance of Islam, either splitting authority over Arabia with the Prophet (ﷺ), taking the Bedouin lands for himself, or being named as the Prophet's (ﷺ) successor, all of which were refused. When the seventy Companions sent to Najd under Abū al-Barāʾ's protection reached Biʼr Maʿūnah (4 AH) and sent Ḥarām ibn Milḥān ahead with a letter, ʿĀmir, reportedly a relative of Abū al-Barāʾ himself, disregarded the guaranteed protection and had him assassinated in secret. He then mobilized three allied tribes (ʿUṣayyah, Riʿl, and Dhakwān) to massacre the remaining Companions, killing all but three. The Prophet (ﷺ) cursed his tribe by name in a month-long qunūt. ʿĀmir later died an agonizing and humiliating death from a leprosy-like disease that spread across his body, abandoned by his own people.